Nail file



FIG. 1 is a top plan view of a nail file showing my new design, the bottom plan view being a mirror image;

FIG. 2 is a left side elevational view thereof, the right side being a mirror image;

FIG. 3 is a front elevational view thereof; and

FIG. 4 is a rear elevational view thereof. 

The ornamental design for a nail file, as shown and described. 